EP1879078B1 - Positional-deviation correction apparatus, method of controlling positional deviation, and image forming apparatus - Google Patents

Positional-deviation correction apparatus, method of controlling positional deviation, and image forming apparatus Download PDF

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Publication number
EP1879078B1
EP1879078B1 EP07111150A EP07111150A EP1879078B1 EP 1879078 B1 EP1879078 B1 EP 1879078B1 EP 07111150 A EP07111150 A EP 07111150A EP 07111150 A EP07111150 A EP 07111150A EP 1879078 B1 EP1879078 B1 EP 1879078B1
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EP
European Patent Office
Prior art keywords
correction
pattern
positional
deviation
image forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07111150A
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German (de)
English (en)
French (fr)
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EP1879078A1 (en
Inventor
Hiroaki Ikeda
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Ricoh Co Ltd
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Ricoh Co Ltd
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Publication date
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Publication of EP1879078A1 publication Critical patent/EP1879078A1/en
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Publication of EP1879078B1 publication Critical patent/EP1879078B1/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/50—Picture reproducers
    • H04N1/506—Reproducing the colour component signals picture-sequentially, e.g. with reproducing heads spaced apart from one another in the subscanning direction
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0105—Details of unit
    • G03G15/0131—Details of unit for transferring a pattern to a second base
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
    • G03G15/0194—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to the final recording medium
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points
    • G03G2215/0138—Linear arrangement adjacent plural transfer points primary transfer to a recording medium carried by a transport belt
    • G03G2215/0141—Linear arrangement adjacent plural transfer points primary transfer to a recording medium carried by a transport belt the linear arrangement being horizontal
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0151—Apparatus for electrophotographic processes for producing multicoloured copies characterised by the technical problem
    • G03G2215/0158—Colour registration
    • G03G2215/0161—Generation of registration marks

Definitions

  • the present invention relates to a positional-deviation correction apparatus, a method of controlling a positional deviation, and an image forming apparatus to obtain an image visualized by superimposing a plurality of colors by an electrophotographic printer and the like.
  • a test pattern is printed on the left and right sides of a recording medium in a conveying direction and includes a first pattern and a second pattern opposing to each other.
  • the first pattern includes stripes formed at a specific interval, and each strip has a specific line width.
  • the second pattern also includes strips formed at a specific interval, and each strip has a specific line width; however, the specific interval is different from the interval of the first pattern.
  • Japanese Patent Application Laid-Open No. 2002-244387 discloses a technology that has a mode for executing each of a plurality of processes, enables a user to select a desired mode and performs positional alignment of the colors appropriate to the user selected mode.
  • a positional-deviation correction apparatus creates images of a plurality of sets of positional deviation correction patterns and detects positional information of each set, in an unambiguous time from start of exposure.
  • a tolerance in layout size of the positional-deviation correction apparatus such as a stretching of an intermediate transfer belt
  • this unambiguous time cannot be inserted between the respective sets of the correction patterns. This leads to a problem that not all the positional information of the sets of the correction patterns can be read.
  • EP 1 369 749 A2 and EP 1 345 088 A1 disclose apparatuses and methods for determining colour offset in image forming which are designed to end acquisition of positional measurements as soon as a last correction pattern has been detected.
  • EP 1369 749 A2 discloses an apparatus and a method according to the preambles of claims 1 and 6, respectively.
  • EP 1 469 493 A1 discloses a color image forming apparatus with a positional error correction method which employs a small positional error mode and a large positional error mode.
  • EP 1 787 012 A2 discloses a color drift error correcting method and an image forming apparatus in which it is checked whether data storage is properly conducted.
  • a positional-deviation correction apparatus is provided according to claim 1.
  • a method of controlling positional-deviation is provided according to claim 6.
  • image forming units of respective colors are arranged along a conveyor belt (endless transporting unit).
  • This arrangement is a so-called tandem type arrangement.
  • a plurality of image forming units (electrophotographic processing units) 6Y, 6M, 6C, and 6BK are arranged along the conveyor belt 5 sequentially from the upstream side in a conveying direction of the conveyor belt 5.
  • the image forming units 6Y, 6M, 6C, and 6BK are collectively referred to as an image creating unit 30.
  • Paper (recording paper) are stacked in a paper feed tray 1.
  • a paper feed roller 2 picks-up one paper 4 from the paper feed tray 1, and a pair of separation rollers 3 conveys the paper 4 to the conveyor belt 5.
  • the conveyor belt 5 conveys the paper 4 to the image creating unit 30.
  • each of the image forming units 6Y, 6M, 6C, and 6BK are the same, except that each of them corresponds to a different color. Specifically, the yellow image forming unit 6Y forms a yellow image, the magenta image forming unit 6M forms a magenta image, the cyan image forming unit 6C forms a cyan image, and the black image forming unit 6BK forms a black image.
  • the yellow image forming unit 6Y will be described in detail below. Because the other image forming units 6M, 6C, and 6BK have the same configuration as the yellow image forming unit 6Y, their description is omitted.
  • the conveyor belt 5 is an endless belt.
  • the conveyor belt 5 is rolled on a driving roller 7 and a driven roller 8.
  • a driving motor (not shown) rotates and drives the driving roller 7.
  • the conveyor belt 5 rotates with the rotation of the driving roller 7.
  • the driving motor, the driving roller 7, and the driven roller 8 function as a driving unit for the conveyor belt 5.
  • the paper 4 conveyed to the conveyor belt 5 sticks to the conveyor belt 5 because of an electrostatic adsorption force, and the paper 4 moves with the rotation of the conveyor belt 5.
  • the paper 4 is conveyed to a position below the yellow image forming unit 6Y, and a yellow toner image on the yellow image forming unit 6Y is transferred onto the paper 4.
  • the yellow image forming unit 6Y includes a photosensitive drum 9Y that is a photosensitive body.
  • a charger 10Y, a developing unit 12Y, a cleaning unit (not shown), and a de-charger 13Y are arranged around the photosensitive drum 9Y.
  • An optical writing unit 11 emits laser lights 14Y, 14M, 14C, and 14BK, which are exposure light corresponding to colors of an image formed by the respective image forming units 6Y, 6M, 6C, and 6BK.
  • a surface of the photosensitive drum 9Y is exposed to the laser light 14Y corresponding to the yellow image, after uniformly charged by the charger 10Y in the dark, thereby forming an electrostatic latent image.
  • the developing unit 12Y visualizes the electrostatic latent image with the yellow toner, thereby forming the yellow toner image on the photosensitive drum 9Y.
  • the toner image is transferred on the paper 4 by a transferring unit 15Y, at a position (transfer position) where the photosensitive drum 9Y comes in contact with the paper 4 on the conveyor belt 5. As a result, a yellow toner image is formed on the paper 4. After removing unnecessary residual toner left on the surface of the photosensitive drum 9Y with the cleaning unit, the photosensitive drum 9Y that has finished the transferring of the toner image is de-charged with the de-charger 13Y. Then, the photosensitive drum 9Y waits for the formation of the next image.
  • the conveyor belt 5 then conveys the paper 4 with the yellow toner image to a position below the magenta image forming unit 6M.
  • a photosensitive drum 9M of the magenta image forming unit 6M carries a magenta toner.
  • the magenta toner image is transferred on the paper 4 so that it superposes onto the yellow image already formed on the paper 4.
  • the conveyor belt 5 conveys the paper 4 to the cyan image forming unit 6C and then to the black image forming unit 6BK.
  • a cyan toner image, and a black toner image are superimposed and transferred on the paper 4.
  • a full color image is formed on the paper 4.
  • the paper 4 with the full color image is then separated from the conveyor belt 5 and conveyed to a fixing unit 16 where the full color image is fixed to the paper 4.
  • a positional deviation occurs between the respective colors, because the toner images of the respective colors do not superimpose at a position where they should theoretically.
  • Such a positional deviation can occur due displacement of the axes of the photosensitive drums 9Y, 9M, 9C, and 9BK, non-parallelism of the photosensitive drums 9Y, 9M, 9C, and 9BK, displacement of a deflecting mirror (not shown) that deflects laser light in the optical writing unit 11, a error in writing timing of the electrostatic latent image to the photosensitive drums 9Y, 9M, 9C, 9BK, and the like.
  • sensors 17, 18, and 19 are arranged at the downstream side of the black image forming unit 6BK along the main scanning direction, which is a direction perpendicular to the direction of rotation of the conveyor belt 5.
  • the sensors 17, 18, and 19 function as an image detecting unit.
  • Fig. 2 is an enlarged perspective view of the image detecting unit and a periphery thereof.
  • Fig. 3 is a schematic diagram of the image detecting unit.
  • the image detecting unit includes a light emitting unit 20, a slit 21, and a light receiving unit 22.
  • the image detecting unit detects positional deviation correction patterns 23 formed on the conveyor belt 5.
  • One image detecting unit is arranged at each of the both edges and the center in the main scanning direction of the conveyer belt 5.
  • a correction pattern 23 is formed on the conveyer belt 5.
  • the correction pattern 23 includes correction marks 23a, 23b, and 23c each corresponding to each of the image detecting unit.
  • Fig. 4 is an enlarged view of the slit 21.
  • the slit 21 includes two openings: one for detecting a line parallel to the main scanning direction (hereinafter, "parallel line”) and another one for detecting a line inclined to the parallel line (hereinafter, "oblique line”).
  • Fig. 5 is an enlarged view of the correction pattern 23.
  • Each of the correction marks 23a, 23b, and 23c includes two sets of black (K), magenta (M), yellow (Y), and cyan (C) lines.
  • One set of the lines includes parallel lines and the other set includes oblique lines.
  • Each line is separated by a predetermined target length d from an adjoining line.
  • Fig. 6 is a block diagram of a controlling system 40 that processes the data detected by the image detecting unit.
  • the controlling system 40 includes a central processing unit (CPU) 31 that executes a predetermined arithmetic processing based on the detected data. Specifically, the CPU 31 calculates respective amounts of skew, positional deviation of the resist in the sub-scanning direction, magnification error in the main scanning direction, and positional deviation of the resist in the main scanning direction.
  • CPU central processing unit
  • the skew can be corrected, for example, by adjusting the inclination of the deflecting mirror in the optical writing unit 11, or by adjusting the optical writing unit 11.
  • the positional deviation of the resist in the sub-scanning direction can be corrected, for example, by controlling a write start timing of the line and a surface phase of a polygon mirror.
  • the magnification error in the main scanning direction can be corrected, for example, by changing image writing frequency.
  • the positional deviation of the resist in the main scanning direction can be corrected by correcting write start timing in the main scanning direction.
  • Fig. 5 is an example of a minimum set of patterns required to calculate different color registration deviation amounts of respective colors.
  • a plurality of sets of marks may be formed with respect to one cycle of the photosensitive body, and their correction patterns may be detected by the sensors 17, 18, and 19, thereby taking a mean value of the detection result.
  • more accurate detection can be performed.
  • the process to process the detected data is to be explained with reference to Fig. 6 .
  • the signals obtained from the light receiving unit 22 are amplified by an amplifier (AMP) 24.
  • Signal components only detected at the line are passed through by a filter 25, and converted into digital data from analog data, by an analog/digital (A/D) converter 26.
  • Sampling of the data is controlled by a sample controlling unit 27, and the sampled data is stored in a first-in-first-out (FIFO) memory 28.
  • FIFO first-in-first-out
  • the stored data is loaded in the CPU 31 and a random access memory (RAM) 32 by a data bus via an I/O port 29.
  • the CPU 31 executes a predetermined arithmetic processing, and calculates the different deviation amounts.
  • a read only memory (ROM) 33 not only the computer program to calculate the various deviation amounts, but also various computer programs to control the positional-deviation correction apparatus and the image forming apparatus according to the present embodiment of the present invention are stored.
  • the CPU 31 monitors the detection signals from the light receiving unit 22 at an appropriate timing, and controls an amount of emitting light by a light emitting amount controlling unit 35. This enables to carry out a reliable detection even if the conveyor belt and the light emitting unit 20 may deteriorate, for example.
  • the level of light-receiving signals from the light receiving unit 22 is always kept constant. Accordingly, the CPU 31 and the ROM 33 function as controlling units to control an entire operation of the image forming apparatus.
  • Fig. 7 is a block diagram of a functional configuration of a positional deviation correction portion in the image forming apparatus according to the embodiment of the present invention.
  • the reference numeral 40 denotes the controlling system having a microcomputer such as the CPU 31, the RAM 32, the ROM 33, and a timer (not shown).
  • the reference numeral 50 denotes a second pattern hereinafter described. Their functions are to be described below with reference to the flowcharts of Figs. 9 and 11 .
  • FIG. 9 A flowchart of a method of arithmetically controlling a positional deviation correction (first controlling example) is shown in Fig. 9 .
  • a process of exposing the second pattern 50 and a plurality (N sets) of the correction patterns 23 is started (step S11).
  • the second pattern 50 is preferably in yellow.
  • Figs. 8A and 8B are schematic diagrams of the second pattern 50 and N sets of the correction patterns 23.
  • it is decided whether the second pattern 50 is detected by the sensors 17, 18, and 19 step S12). If the second pattern 50 is detected by the sensors 17, 18, and 19, the system control is given to step S13.
  • the timer starts reading positional information of the correction patterns 23 of the N-th set.
  • the timer may have a timer value corresponding to a pattern interval between the second pattern 50 and the correction patterns 23 formed at step S11.
  • step S14 it is decided whether the timers have reached a predetermined value.
  • the positional information of one set of marks in the RAM 32 is loaded (step S15). Then, it is judge whether the positional information of all the sets of marks are loaded in the RAM (step S16). If the positional information of all the sets of marks are not loaded, the system control is returned to step S13. If the positional information of all the sets of marks are loaded, the system control is goes to step S17.
  • step S17 different deviation amounts are calculated based on the loaded positional information.
  • step S18 the correction amounts corresponding to the deviation amounts are stored in the RAM, and the controlling of the positional deviation correction is completed.
  • FIG. 11 A flowchart of a different method for arithmetically controlling the positional deviation (second controlling example) is shown in Fig. 11 .
  • the process shown in Fig. 11 is executed by the controlling unit 40.
  • exposing is started of the second pattern 50 and a plurality (N sets) of the correction patterns 23.
  • the second pattern 50 is preferably in yellow.
  • Figs. 10A and 10B are schematic diagrams of the second pattern 50 and N sets of the correction patterns 23.
  • the timer starts reading the positional information of the correction patterns 23 of the N-th set.
  • the timer may have the timer value corresponding to the pattern interval between the second pattern 50 and the correction patterns 23 formed at step S21.
  • step S24 it is decided whether the timers have reached a predetermined value. If the timers haves reached the predetermined value, the positional information of one set of marks is loaded in the RAM 32 (step S25). It is judge whether the positional information of all the sets of marks are loaded in the RAM 32 (step S26). If the positional information of all the sets of marks are not loaded, the system control is returned to step S22. If the positional information of all the sets of marks are loaded, the system control is goes to step S27.
  • step S27 different deviation amounts are calculated based on the loaded positional information.
  • step S28 the correction amounts corresponding to the deviation amounts are stored in the RAM 32, and the controlling of the positional deviation correction is completed.
  • the respective embodiments are exemplary embodiments of the present invention, and various modifications are possible within the scope of the present invention as defined by the claims.
  • the endless transporting unit where the image is formed may be an intermediate transfer belt.
  • the slit is used as the image detecting unit, as long as the correction patterns 23 can be detected, it is not limited to this configuration, but may be the one without the slit. Also, the detection patterns are aligned vertically and horizontally, but as long as the positional deviation can be detected, it is not limited to this, and the detection patterns may be peak patterns and the like.
  • the second pattern 50 which is different from the correction patterns 23, is formed ahead of the correction patterns 23 in the sub-scanning direction.
  • the timing to start detecting the positional information of each set of the correction patterns 23 is decided, after detecting the positional information of the second pattern 50. This prevents a problem in which the positional information of the correction patterns 23 cannot be detected due to tolerance in the layout size, and the accurate positional correction cannot be performed.
  • the second pattern 50 is formed before forming the correction patterns 23.
  • the timing to start detecting the positional information of a number of sets of the correction patterns is determined, after detecting the positional information of the second pattern 50.
  • the positional information of the second set of the second pattern 50 is detected, after detecting the final set of the correction patterns. Repeating these can prevent a problem in which the positional information of the correction patterns 23 cannot be detected due to the tolerance in the layout size resulting from environmental fluctuation and the like, and the accurate positional deviation correction cannot be performed.
  • the second pattern 50 is formed before forming the correction patterns 23.
  • the second pattern 50 is formed in an image forming color furthest from the positional detecting unit.
  • the timing to start detecting the positional information of each set of the correction patterns 23 is determined, after detecting the positional information of the second pattern 50. This prevents a problem in which the positional information of the correction patterns cannot be detected due to the tolerance in the layout size, and the accurate positional deviation correction cannot be performed.
  • a low-cost apparatus that is capable of detecting the second pattern 50 without fail, and reducing toner consumption required to form the second pattern 50 can be achieved.
  • the positional-deviation correction apparatus forms the second pattern that is different from the correction patterns, before forming the correction patterns.
  • the timing to start detecting the positional information of a number of set of the correction patterns is determined, after detecting the positional information of the second pattern.
  • the positional information of the second set of the second pattern is detected, after detecting the final set of the patterns.
  • the positional-deviation correction apparatus forms the second pattern that is different from the correction patterns, before forming the correction patterns.
  • the second pattern may be formed in the image forming color furthest from the positional detecting unit.
  • the timing to start detecting the positional information of each set of the correction patterns is determined, after the positional information of the second pattern is detected.
  • the positional-deviation correction apparatus forms the second pattern in one straight line in the main scanning direction. As a result, it offers an advantage of detecting the second pattern without fail.
  • the positional-deviation correction apparatus sets a number of the second pattern corresponding to the number of the positional detecting unit. As a result, it offers an advantage of detecting the second pattern without fail, and reducing toner consumption required to form the second pattern.
  • the method of controlling positional deviation forms the second pattern that is different from the correction patterns, before forming the correction patterns.
  • the timing to start detecting the positional information of each set of the correction patterns is determined, after detecting the positional information of the second pattern.
  • the method of controlling positional deviation forms the second pattern that is different from the correction patterns, before forming the correction patterns.
  • the timing to start detecting the positional information of a number of set of the correction patterns is determined, after detecting the positional information of the second pattern.
  • the positional information of the second set of the second pattern is detected, after detecting the final set of the patterns.
  • the method of controlling positional deviation according to the sixth or seventh aspect forms the second pattern that is different from the correction patterns, before forming the correction patterns.
  • the second pattern may be formed in the image forming color furthest from the positional detecting unit.
  • the timing to start detecting the positional information of each set of the correction patterns is determined, after detecting the positional information of the second pattern.
  • the method of controlling positional deviation forms the second pattern in one straight line in the main scanning direction. As a result, it offers an advantage of detecting the second pattern without fail.
  • the method of controlling positional deviation sets the number of the second pattern corresponding to the number of the positional detecting unit. As a result, it offers an advantage of detecting the second pattern without fail, and reducing toner consumption required to form the second pattern.
  • an image forming apparatus comprises the positional-correction apparatus discussed above.
EP07111150A 2006-07-11 2007-06-27 Positional-deviation correction apparatus, method of controlling positional deviation, and image forming apparatus Not-in-force EP1879078B1 (en)

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JP2006190722A JP4948925B2 (ja) 2006-07-11 2006-07-11 位置ずれ補正装置、位置ずれ制御方法、および画像形成装置

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EP1879078A1 EP1879078A1 (en) 2008-01-16
EP1879078B1 true EP1879078B1 (en) 2012-11-28

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EP (1) EP1879078B1 (ja)
JP (1) JP4948925B2 (ja)
CN (1) CN101105667A (ja)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7952774B2 (en) * 2006-08-21 2011-05-31 Ricoh Company, Limited Image forming apparatus, image formation control method, and computer program product
JP4506827B2 (ja) * 2007-12-25 2010-07-21 ブラザー工業株式会社 画像形成装置
JP2009230111A (ja) * 2008-02-25 2009-10-08 Ricoh Co Ltd 画像形成装置、位置ズレ補正制御方法、及び位置ズレ補正制御プログラム
JP5163457B2 (ja) * 2008-12-03 2013-03-13 株式会社リコー トナー情報検出方法および反射型光学センサ装置および画像形成装置
JP5262766B2 (ja) * 2009-01-29 2013-08-14 株式会社リコー 画像形成装置
JP5365917B2 (ja) * 2009-06-16 2013-12-11 株式会社リコー 画像形成装置
JP5321370B2 (ja) * 2009-09-09 2013-10-23 株式会社リコー 光書き込み装置、画像形成装置及び光書き込み装置の位置ずれ補正方法
JP5287625B2 (ja) * 2009-09-14 2013-09-11 株式会社リコー 画像形成装置及び位置ずれ補正方法
JP5495716B2 (ja) * 2009-10-30 2014-05-21 キヤノン株式会社 移動検出装置および記録装置
JP5653283B2 (ja) * 2010-06-30 2015-01-14 キヤノン株式会社 カラー画像形成装置及び画像形成装置
JP5565217B2 (ja) * 2010-08-31 2014-08-06 株式会社リコー 光書き込み装置、画像形成装置、および光書き込み制御方法
JP5609965B2 (ja) * 2012-12-20 2014-10-22 株式会社リコー トナー情報検出方法および反射型光学センサ装置および画像形成装置
JP5998956B2 (ja) * 2013-01-28 2016-09-28 株式会社リコー 光書き込み制御装置、画像形成装置及び光書き込み制御方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1345088A1 (en) * 2002-03-14 2003-09-17 Ricoh Company Colour image forming apparatus avoiding speed related pixel size variation

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3506891B2 (ja) 1997-11-27 2004-03-15 京セラ株式会社 画像形成装置の転写位置ずれ補正方法
JP3890833B2 (ja) * 1999-11-02 2007-03-07 富士ゼロックス株式会社 カラー画像形成位置ずれ検出装置及びこれを用いた画像形成装置
JP2001166553A (ja) * 1999-12-13 2001-06-22 Ricoh Co Ltd カラー画像形成装置
JP3883177B2 (ja) 2001-02-19 2007-02-21 株式会社リコー カラー画像形成装置
JP2004012549A (ja) 2002-06-03 2004-01-15 Ricoh Co Ltd カラー画像形成の色ずれ検出方法、その装置及びカラー画像形成装置
JP3604683B2 (ja) * 2002-09-24 2004-12-22 株式会社リコー カラー画像形成装置、タンデムドラム式カラー画像形成装置、およびカラー画像形成装置に用いるプロセスカートリッジ
GB0308982D0 (en) 2003-04-17 2003-05-28 Inertia Switch Ltd Improvements in and relating to switches
JP2005031263A (ja) 2003-07-09 2005-02-03 Ricoh Co Ltd 画像形成装置
JP4559124B2 (ja) * 2003-07-31 2010-10-06 株式会社リコー 色ずれ検出補正方法及びカラー画像形成装置
US7162171B2 (en) * 2003-08-22 2007-01-09 Ricoh Company, Ltd. Method, system and software program for correcting positional color misalignment
JP2005091901A (ja) * 2003-09-18 2005-04-07 Ricoh Co Ltd カラー画像形成装置
JP4641399B2 (ja) * 2004-06-30 2011-03-02 株式会社リコー カラー画像形成装置およびその制御方法
DE102004039800B4 (de) 2004-08-17 2006-07-27 Hydraulik-Ring Gmbh Nockenwellenverstellsystem
JP2006126283A (ja) * 2004-10-26 2006-05-18 Fuji Xerox Co Ltd 画像形成装置
JP4948042B2 (ja) 2005-10-31 2012-06-06 株式会社リコー 色ずれ補正方法および画像形成装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1345088A1 (en) * 2002-03-14 2003-09-17 Ricoh Company Colour image forming apparatus avoiding speed related pixel size variation

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EP1879078A1 (en) 2008-01-16
US20080273907A1 (en) 2008-11-06
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US7734234B2 (en) 2010-06-08
JP2008020552A (ja) 2008-01-31

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